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Join Date: Aug 2005
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There is no "UNIX" to download. UNIX is to operating systems what the IEEE is to electrical sockets. It's a definition, not an actual thing. If an OS has certain features provided in a certain way, it can be certified as a UNIX one.
UNIX includes BSD, Solaris, OSX, IRIX, QNX, HP-UX, AIX, and hosts of others. Many of these can't run on a standard PC.